Senior SDET: Backend Test Automation & Framework Lead

Luxoft; Polska; On-site; PLN 180,000 - 270,000; Full time

Benefits offered by this job

Private Medical & Dental care

Life Insurance

MyBenefit program

Job summary

Luxoft in Poland is seeking a hands-on SDET to own backend test automation across REST, WebSocket, and Kafka. You will co-architect and co-own a unified testing framework with the UI SDET, covering UI, API, messaging, data and performance tests.

The role requires in-depth knowledge of Python, Java, TypeScript and cloud environments (AWS). You will build test environments in Linux and AWS, drive CI/CD, and ensure release quality through structured logs and traces.

Qualifications

• 5+ years of backend or service test automation, including framework design.
• Strong Python (pytest, requests, asyncio, confluent-kafka or similar) for test frameworks, tooling and data validation.
• Strong Java (JUnit 5, REST Assured, AssertJ, or similar) for testing JVM services.
• Working TypeScript and Node.js skills: contributing to UI and cross-layer suites in the shared framework, and Node-based tooling (k6 scripts, Playwright API tests).
• Hands-on Kafka experience: producing and consuming in tests, consumer groups, partitions and offsets, serialization and schema registry, and Kafka Streams or Connect.
• Solid networking fundamentals: TCP/IP, HTTP/1.1 and HTTP/2, WebSockets, TLS, DNS, load balancers, latency and packet loss.
• Strong SQL and database experience (PostgreSQL, SQL Server, or similar) for test data setup, verification and cleanup.
• Hands-on performance and load testing: Tools: k6, Gatling, JMeter or Locust; profiling and latency analysis.

Responsibilities

• Design and build automated service, integration and contract tests for REST APIs, WebSocket services, and Kafka producers and consumers.
• Test event-driven flows end to end: message ordering, idempotency, at-least-once and exactly-once semantics, replays, offset handling, dead-letter queues, and schema evolution.
• Build harnesses with controlled test data and service virtualization so suites run consistently and can be repeated.
• Design and build isolated, on-demand test environments on Linux and AWS: full service stacks per branch or run, seeded data and known state, torn down automatically.
• Write data-validation tests across relational and analytical databases. Cover reconciliation and aggregation correctness.
• Cover resilience and failure modes: broker and consumer outages, network partitions, timeouts, throttling, and authentication failures.
• Own backend performance testing: latency and throughput, baselines, and regressions; optimize CPU, GC, query or network.
• Own backend test execution in CI/CD: parallel runs, scheduled regressions, environment setup and teardown.
• Make failures diagnosable: structured logs, distributed traces, correlation IDs, and clear reports.
• Work with backend engineers, infrastructure, business analysts and traders to automate critical workflows.

Skills

Backend test automation

Python

Java

TypeScript & Node.js

Kafka

SQL databases

CI/CD

Linux command line

Tools

pytest

requests

asyncio

confluent-kafka

JUnit 5

REST Assured

Playwright

k6

JMeter

Locust

Docker

Testcontainers

AWS

Terraform

Job description

Luxoft in Poland is seeking a hands-on SDET to own backend test automation across REST, WebSocket, and Kafka. You will co-architect and co-own a unified testing framework with the UI SDET, covering UI, API, messaging, data and performance tests.

The role requires in-depth knowledge of Python, Java, TypeScript and cloud environments (AWS). You will build test environments in Linux and AWS, drive CI/CD, and ensure release quality through structured logs and traces.